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Just attempted to replace my worn chainrings on my XT chainset (M770) and the chainring bolts are not hex keys, which has me stumped as all the ones i've changed before, including shimano ones, have been. It looks as though it's a star drive type shape but definitely bigger than disc rotors.
Anyone point me in the right direction? Thanks.
One of these things?
http://www.chainreactioncycles.com/park-tool-chainring-nut-wrench-cnw2/rp-prod14305
Other similar products are available, but I think that's the one I ended up with.
some are torx I think
Torx bolt, no?
T30?
Not sure of exact size, but was a standard Torx bit from the toolbox.
Ahh.. Torx bolts, is that what they are called! typically the only one i own is for disc rotor bolts, looks like a trip to Wickes then. Thanks.
I've done mine with a T30 but there's a little more play than in other T30 fittings - not sure what Shimano have done.
it's just a bigger Torx bolt than the disc brakes ones.
buy a Torx key set and you're sorted.
it's either T30 or maybe T32 Torx
Dunno what torque they use in the factory either, but mine were "pretty damn tight".
Torx is ace. Won't round out like Hex bolts.
Fortunately happened to have a socket set with a handful of Torx bits, rather than just the usual T25.
I think that Shimano uses a threadlock compound; that's why it takes so much force to break the fasteners free.
Torx is ace. Won't round out like Hex bolts.
I don't find it any different really, they still round out.
Mixing hex and torx on a bike is a pain, just means another tool to carry.
"I don't find it any different really, they still round out. "
get the correct tools then.
with a propper fitting torx key (i suggest wera) the fixture can take much more torque than hex key.
on this note - hex plus from wera - AWESOME , much tighter fit in hex bolts than even my bondhaus keys.
Don't bother with Wickes - take this as an opportunity to get a nice park tools fold up allen / torx tool.
Either a [url= http://www.summittosea.co.uk/cnw2-chainring-nut-tool-by-park-tool.ir?cName=cycling-cycle-components-accessories-tools-worshop-tools-workstands-workshop-tools ]CNW-2[/url] or one of these [url= http://www.summittosea.co.uk/cyclo-chain-ring-bolt-tool.ir?cName=cycling-cycle-components-accessories-tools-worshop-tools-workstands-workshop-tools ]cyclo chain nut tools[/url] and a [url= http://www.summittosea.co.uk/ywrench-torx-key-triple-t25-t30-t40-pro-by-shimano.ir?cName=cycling-cycle-components-accessories-tools-worshop-tools-workstands-workshop-tools ]Shimano Torx Triple wrench[/url] or the [url= http://www.summittosea.co.uk/park-tool-tws2c-foldup-torx-wrench-set-t7-9-10-15-20-27-30-and-40.ir?cName=cycling-cycle-components-accessories-tools-worshop-tools-workstands-workshop-tools ]Park Tool Folding Torx set[/url]
Any combination of those tools should see you right (unless you buy two sets of Torx!)
😉
Like above, a T30 feels really slack in these, it does the job but it never feels like the right size to me. But I have no T32.4s or whatever it may be.
get the correct tools then
same applies to hex bolts - I've never rounded a hex bolt with my decent Teng ball ended T-handle set, or for that matter my Topeak Alien multitool, but have with cheap hex keys.
after a little more research
i believe the shimano bolts to be a t30 torx PLUS fixing - there is a difference. BUT they are cross compatible with torx head keys - but there will be slop - says the specification for torx plus.